A friend who has a beautiful dove pair who he has been taking eggs from and throwing them away for months just gave me two of their eggs to hatch by one of my dove pair. Im looking to add some different genetics to my flock. The first two eggs he gave me I put into an incubator for a week or more and never saw any vein development by candling them. He just gave me another two eggs but now Im wonder if they will develop. He has let his pair brood young in the past and gave one of the offspring so I know that this pair CAN produce viable eggs. The question is does constantly taking away the eggs from a pair lower their chance of producing viable eggs? By not letting them brood, hatch and raise their young is their enthusiasm dashed so badly that they stop copulating? Anyone with experience on this matter? Note: The reason my friend doesnt want to let his pair hatch babies is because his aviary is very small(4 X 6 X 8' tall). I built a large aviary (14 X 18 X 15' high) so I can comfortably house my flock. Also, does anyone know how many days of incubation is required before evidence of growth is seen in a candled dove egg?